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Fig. 6.

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Comparison of early- (left panel) and later-phase (right panel) spectra of SN 2021aatd to that of SNe 2020faa (Yang et al. 2021), 2017eaw (IIP, Szalai et al. 2019), and 1987A (Pun et al. 1995), respectively. All the spectra are corrected for redshift and extinction. The spectra of SNe 1987A and 2020faa are from the WISeREP database.

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